### Please describe the problem.

When I hit **Add Internet Archive item**, I get:

Internal Server Error  
Unexpected parameters: x-amz-interactive-priority x-amz-mediatype  
git-annex version 8.20210223


### What steps will reproduce the problem?

create a directory; git init; git annex init
start the web ui; point it at said directory

Hit the **+ Add another repository** button

Choose **Internet Archive**

On the _Adding an Internet Archive item_ page, enter access key, secret key

choose Media Type software  
Item Name: commons-software

Hit **Add Internet Archive item**

### What version of git-annex are you using? On what operating system?

git-annex version 8.20210223

linux (ubuntu)

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log


# End of transcript or log.
"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

I recently started trying to use it to manage photos, but I'm struggling a bit to get my head around it.
Today I'm trying to use it to archive my open source software downloads.


